Sport Cat or De-Cat - LotusTalk

BadtZ · 10-14-2009, 11:25 PM

Here I am not asking or arguing about who makes them but to ask,
in general, the advantages and disadvantages between Sport cat and De-cat.

I know de-cat will be louder and allow the exhaust flow more freely, but I am pretty sure there are downsides to them; so is sport cat.
(toxicity, rust SS exhaust much faster, low end power, etc?)

please comment what you have and what your concerns are about the two.

Monsi · 10-15-2009, 01:18 AM

de cat is "not street legal" but reduces the amount of heat in the engine bay significantly

BRTHTAKR · 10-15-2009, 03:28 AM

I love the sound of my Larini decat, but I've tried everything to eliminate the CEL without success.

Frank Amoroso · 10-15-2009, 04:07 AM

Quote:

Originally Posted by BRTHTAKR

I love the sound of my Larini decat, but I've tried everything to eliminate the CEL without success.

Does everything include an ECU tune? When I got my CharlieX ECU tune for the lower cam changeover, I also asked him to account for the Fujita CAI, FF header, hi-flo cat and / or cat bypass. I just got my hands on the cat bypass pipe though, so I haven't been able to test the no CEL theory yet. It's been a couple years though and no CEL as of yet due to the hi-flo cat.

BRTHTAKR · 10-15-2009, 07:30 AM

Quote:

Originally Posted by Frank Amoroso

Does everything include an ECU tune? When I got my CharlieX ECU tune for the lower cam changeover, I also asked him to account for the Fujita CAI, FF header, hi-flo cat and / or cat bypass. I just got my hands on the cat bypass pipe though, so I haven't been able to test the no CEL theory yet. It's been a couple years though and no CEL as of yet due to the hi-flo cat.

Does not. I've tried the resistor and the stacked spark plug antifoulers. If/when I add a supercharger, I'll look to address this issue. Thanks for the suggestion.

gpheck · 10-15-2009, 07:55 AM

I have the larini decat with silencer.. I haven't noticed it being much louder than it was with the cat, but I will say it spews black gooey **** all over the back of my white car - even after only a short drive. After a track event, the entire back of the car turns brown.

Frank Amoroso · 10-15-2009, 12:43 PM

Quote:

Originally Posted by gpheck

I have the larini decat with silencer.. I haven't noticed it being much louder than it was with the cat, but I will say it spews black gooey **** all over the back of my white car - even after only a short drive. After a track event, the entire back of the car turns brown.

Well that sucks. Hopefully my diffuser exit exhaust will keep any such spew off the car.

I'm hoping my car is louder though.

waydui · 10-15-2009, 01:15 PM

I have a decat pipe on my '05 Elise BWR SC.

Yeah, it's loud, but I like it that way.

No CEL because I use a WeaponR "CEL Eliminator". Works perfectly. See pic.

In Ohio, I registered my car as a "Collector" vehicle, which means NO emissions testing.

So I'm "street legal" even with the decat.

Regards,
Wayne

BadtZ · 10-18-2009, 01:57 AM

well loud is fine (pretty sure will love it) but the smell??

maybe have to experience in order to speak

try driving low profile, that might not attract too much unwanted attention?

NL1997 · 10-22-2009, 12:20 PM

decat is a good option but is it worth the hassle when it comes to mot time especially with the undertray?

waydui · 10-22-2009, 12:38 PM

Quote:

Originally Posted by NL1997

decat is a good option but is it worth the hassle when it comes to mot time especially with the undertray?

If you have the quick release fasteners for the undertray and ramps, you can swap out the decat for the cat within 45 minutes. No need to remove the muffler either, although you can with a few extra minutes work.

Not too bad for a once a year project.

Regards,
Wayne

BadtZ · 10-22-2009, 07:15 PM

believe my Vancouver dont need MOt

10-14-2009, 11:25 PM	#1 (permalink)
BadtZ Exige S240 Join Date: May 2009 Location: Vancouver, BC Posts: 123	Sport Cat or De-Cat Here I am not asking or arguing about who makes them but to ask, in general, the advantages and disadvantages between Sport cat and De-cat. I know de-cat will be louder and allow the exhaust flow more freely, but I am pretty sure there are downsides to them; so is sport cat. (toxicity, rust SS exhaust much faster, low end power, etc?) please comment what you have and what your concerns are about the two. __________________ Larini 6" Sport, DBW Pedals...and minor stuff So far so good

10-15-2009, 01:18 AM	#2 (permalink)
Monsi Statistical Anomaly Join Date: Mar 2008 Location: Kauai Posts: 2,291 Images: 21	de cat is "not street legal" but reduces the amount of heat in the engine bay significantly __________________ Dude, there's my car!

10-15-2009, 03:28 AM	#3 (permalink)
BRTHTAKR AKA XHILR8N! Join Date: Dec 2006 Location: Asheville, North Carolina Posts: 1,151 Images: 6	I love the sound of my Larini decat, but I've tried everything to eliminate the CEL without success. __________________ Simplicity is the ultimate sophistication. Leonardo Da Vinci 2005 Elise LRG, Trim Shop interior, full cage, Cup wheels, other stuff. 2007 Toyota Tundra (about 10 cup holders) 2004 BMW X3 (4 small cup holders) 1980 Rover SD1

10-15-2009, 01:15 PM	#8 (permalink)
waydui GR8 SCAPE Join Date: Jun 2005 Location: Kirtland, Ohio Posts: 1,182	I have a decat pipe on my '05 Elise BWR SC. Yeah, it's loud, but I like it that way. No CEL because I use a WeaponR "CEL Eliminator". Works perfectly. See pic. In Ohio, I registered my car as a "Collector" vehicle, which means NO emissions testing. So I'm "street legal" even with the decat. Regards, Wayne Attached Images __________________ _______________________ '05 Elise Magnetic Blue, Black, Touring, Hard Top, Star Shield, Stage II Exhaust, Arqray decat pipe, S2 Front Splitter (UK), Sector 111 Rear Tow Hook, Driving Lights, De-Snorkled, K&N Air Filter, Shift-I System, LSS Dampers & Springs, Sector 111 V-Bar, Schroth Profi II 5 point harness, Exige S Probax seats, 1/4 turn undertray screws, Stealth bulbs, BWR SC with PES tune, Innovative engine mounts, SS brake lines.

10-18-2009, 01:57 AM	#9 (permalink)
BadtZ Exige S240 Join Date: May 2009 Location: Vancouver, BC Posts: 123	well loud is fine (pretty sure will love it) but the smell?? maybe have to experience in order to speak try driving low profile, that might not attract too much unwanted attention? __________________ Larini 6" Sport, DBW Pedals...and minor stuff So far so good

10-15-2009, 07:55 AM	#6 (permalink)
gpheck Registered User Join Date: Sep 2008 Posts: 72	I have the larini decat with silencer.. I haven't noticed it being much louder than it was with the cat, but I will say it spews black gooey **** all over the back of my white car - even after only a short drive. After a track event, the entire back of the car turns brown.

10-22-2009, 12:20 PM	#10 (permalink)
NL1997 Registered User Join Date: Jun 2009 Posts: 4 Images: 1	decat is a good option but is it worth the hassle when it comes to mot time especially with the undertray?

10-22-2009, 07:15 PM	#12 (permalink)
BadtZ Exige S240 Join Date: May 2009 Location: Vancouver, BC Posts: 123	believe my Vancouver dont need MOt __________________ Larini 6" Sport, DBW Pedals...and minor stuff So far so good

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode